[RFC PATCH 3/4] drm/xe: Add dedicated message lock

[Matthew Brost <matthew.brost@intel.com>]

Stop abusing DRM scheduler job list lock for messages, add dedicated
message lock.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_gpu_scheduler.c       | 3 ++-
 drivers/gpu/drm/xe/xe_gpu_scheduler.h       | 4 ++--
 drivers/gpu/drm/xe/xe_gpu_scheduler_types.h | 2 ++
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_gpu_scheduler.c b/drivers/gpu/drm/xe/xe_gpu_scheduler.c
index 455ccaf17314..bfd1aebe70e6 100644
--- a/drivers/gpu/drm/xe/xe_gpu_scheduler.c
+++ b/drivers/gpu/drm/xe/xe_gpu_scheduler.c
@@ -77,6 +77,7 @@ int xe_sched_init(struct xe_gpu_scheduler *sched,
 	};
 
 	sched->ops = xe_ops;
+	spin_lock_init(&sched->msg_lock);
 	INIT_LIST_HEAD(&sched->msgs);
 	INIT_WORK(&sched->work_process_msg, xe_sched_process_msg_work);
 
@@ -130,7 +131,7 @@ void xe_sched_add_msg(struct xe_gpu_scheduler *sched,
 void xe_sched_add_msg_locked(struct xe_gpu_scheduler *sched,
 			     struct xe_sched_msg *msg)
 {
-	lockdep_assert_held(&sched->base.job_list_lock);
+	lockdep_assert_held(&sched->msg_lock);
 
 	list_add_tail(&msg->link, &sched->msgs);
 	xe_sched_process_msg_queue(sched);
diff --git a/drivers/gpu/drm/xe/xe_gpu_scheduler.h b/drivers/gpu/drm/xe/xe_gpu_scheduler.h
index e548b2aed95a..04f85c4f7e80 100644
--- a/drivers/gpu/drm/xe/xe_gpu_scheduler.h
+++ b/drivers/gpu/drm/xe/xe_gpu_scheduler.h
@@ -32,12 +32,12 @@ void xe_sched_add_msg_locked(struct xe_gpu_scheduler *sched,
 
 static inline void xe_sched_msg_lock(struct xe_gpu_scheduler *sched)
 {
-	spin_lock(&sched->base.job_list_lock);
+	spin_lock(&sched->msg_lock);
 }
 
 static inline void xe_sched_msg_unlock(struct xe_gpu_scheduler *sched)
 {
-	spin_unlock(&sched->base.job_list_lock);
+	spin_unlock(&sched->msg_lock);
 }
 
 static inline void xe_sched_stop(struct xe_gpu_scheduler *sched)
diff --git a/drivers/gpu/drm/xe/xe_gpu_scheduler_types.h b/drivers/gpu/drm/xe/xe_gpu_scheduler_types.h
index 6731b13da8bb..63d9bf92583c 100644
--- a/drivers/gpu/drm/xe/xe_gpu_scheduler_types.h
+++ b/drivers/gpu/drm/xe/xe_gpu_scheduler_types.h
@@ -47,6 +47,8 @@ struct xe_gpu_scheduler {
 	const struct xe_sched_backend_ops	*ops;
 	/** @msgs: list of messages to be processed in @work_process_msg */
 	struct list_head			msgs;
+	/** @msg_lock: Message lock */
+	spinlock_t				msg_lock;
 	/** @work_process_msg: processes messages */
 	struct work_struct		work_process_msg;
 };
-- 
2.34.1